Illinois 156 is a fairly short east-west route in southwestern Illinois. It connects together many rural towns in Monroe County.

Intersections from east to west:

IL156 begins at IL13 near New Athens

IL156 joins IL159 south into Monroe County

IL156 leaves to go west again at Hecker

IL3 at Waterloo

IL156 ends in the west at a point near the town of Valmeyer and close to the Mississippi River.

It passes through these towns: Hecker, Waterloo, and Valmeyer.

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